theyre
Theyre is a nonstandard spelling of they’re, the standard contraction of they are. In formal English, the correct form is they’re, with an apostrophe indicating the omitted letters. The digraph is a typical example of how contractions arise in English, combining a pronoun with a verb to create a shorter form.
The words they’re, their, and there are a common trio of homophones that can be confusing. Their
In practice, they’re appears most often in spoken language transcriptions, informal writing, and digital communication where
Etymology and history: contractions such as they’re date from the development of early modern English, when
See also: apostrophe usage, English contractions, their, there, they're.